C+♯9+♭1
C major, add sharp ninth, add flat root

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MSK 007 Leapfrog VCF
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MSK 009 Coiler VCF
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Equivalent chord symbols: G6♯5+4, C+♯2+♭1, C+♭1+♭3, B♯+♯2+♭1, B♯+♯9+♭1, B♯+♭1+♭3.
Notes in this chord: C♭, C, E, G, D♯. Integer notation: {0, 3, 4, 7, 11}.
Nearby chords (one less note): C+♯2, C+♭1, G6♯5, B4+♯1, E♭6♯5.
Nearby chords (one more note): CM11♯9, CM9+♯2, Am11♯11, B+4+♯1+♯5, E♭6+♯1+♯5, C+♯1+♯2+♭1, C+♯2+♯5+♭1.
Parallel chords (same structure, different root): D+♯9+♭1, E+♯9+♭1, F+♯9+♭1, G+♯9+♭1, A+♯9+♭1, B+♯9+♭1, C♭+♯9+♭1, D♭+♯9+♭1, E♭+♯9+♭1, F♭+♯9+♭1, G♭+♯9+♭1, A♭+♯9+♭1, B♭+♯9+♭1, C♯+♯9+♭1, D♯+♯9+♭1, E♯+♯9+♭1, F♯+♯9+♭1, G♯+♯9+♭1, A♯+♯9+♭1, B♯+♯9+♭1.
Experimental fretting charts for guitar standard EADGBE tuning (change tuning or instrument):
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